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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/chromeos/display/overscan_calibrator.h"
#include <stdint.h>
#include <limits>
#include "ash/display/display_info.h"
#include "ash/display/display_manager.h"
#include "ash/display/window_tree_host_manager.h"
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "base/callback.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkPath.h"
#include "ui/aura/window.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/paint_recorder.h"
#include "ui/gfx/canvas.h"
namespace chromeos {
namespace {
// The opacity for the arrows of the overscan calibration.
const float kArrowOpacity = 0.8;
// The height in pixel for the arrows to show the overscan calibration.
const int kCalibrationArrowHeight = 70;
// The gap between the boundary and calibration arrows.
const int kArrowGapWidth = 0;
// Draw the arrow for the overscan calibration to |canvas|.
void DrawTriangle(int x_offset,
int y_offset,
double rotation_degree,
gfx::Canvas* canvas) {
// Draw triangular arrows.
SkPaint content_paint;
content_paint.setStyle(SkPaint::kFill_Style);
content_paint.setColor(SkColorSetA(
SK_ColorBLACK, std::numeric_limits<uint8_t>::max() * kArrowOpacity));
SkPaint border_paint;
border_paint.setStyle(SkPaint::kStroke_Style);
border_paint.setColor(SkColorSetA(
SK_ColorWHITE, std::numeric_limits<uint8_t>::max() * kArrowOpacity));
SkPath base_path;
base_path.moveTo(0, 0);
base_path.lineTo(SkIntToScalar(-kCalibrationArrowHeight),
SkIntToScalar(-kCalibrationArrowHeight));
base_path.lineTo(SkIntToScalar(kCalibrationArrowHeight),
SkIntToScalar(-kCalibrationArrowHeight));
base_path.close();
SkPath path;
gfx::Transform rotate_transform;
rotate_transform.Rotate(rotation_degree);
gfx::Transform move_transform;
move_transform.Translate(x_offset, y_offset);
rotate_transform.ConcatTransform(move_transform);
base_path.transform(rotate_transform.matrix(), &path);
canvas->DrawPath(path, content_paint);
canvas->DrawPath(path, border_paint);
}
} // namespace
OverscanCalibrator::OverscanCalibrator(
const gfx::Display& target_display, const gfx::Insets& initial_insets)
: display_(target_display),
insets_(initial_insets),
initial_insets_(initial_insets),
committed_(false) {
// Undo the overscan calibration temporarily so that the user can see
// dark boundary and current overscan region.
ash::Shell::GetInstance()->window_tree_host_manager()->SetOverscanInsets(
display_.id(), gfx::Insets());
ash::DisplayInfo info =
ash::Shell::GetInstance()->display_manager()->GetDisplayInfo(
display_.id());
aura::Window* root = ash::Shell::GetInstance()
->window_tree_host_manager()
->GetRootWindowForDisplayId(display_.id());
ui::Layer* parent_layer =
ash::Shell::GetContainer(root, ash::kShellWindowId_OverlayContainer)
->layer();
calibration_layer_.reset(new ui::Layer());
calibration_layer_->SetOpacity(0.5f);
calibration_layer_->SetBounds(parent_layer->bounds());
calibration_layer_->set_delegate(this);
parent_layer->Add(calibration_layer_.get());
}
OverscanCalibrator::~OverscanCalibrator() {
// Overscan calibration has finished without commit, so the display has to
// be the original offset.
if (!committed_) {
ash::Shell::GetInstance()->window_tree_host_manager()->SetOverscanInsets(
display_.id(), initial_insets_);
}
}
void OverscanCalibrator::Commit() {
ash::Shell::GetInstance()->window_tree_host_manager()->SetOverscanInsets(
display_.id(), insets_);
committed_ = true;
}
void OverscanCalibrator::Reset() {
insets_ = initial_insets_;
calibration_layer_->SchedulePaint(calibration_layer_->bounds());
}
void OverscanCalibrator::UpdateInsets(const gfx::Insets& insets) {
insets_.Set(std::max(insets.top(), 0),
std::max(insets.left(), 0),
std::max(insets.bottom(), 0),
std::max(insets.right(), 0));
calibration_layer_->SchedulePaint(calibration_layer_->bounds());
}
void OverscanCalibrator::OnPaintLayer(const ui::PaintContext& context) {
ui::PaintRecorder recorder(context, calibration_layer_->size());
static const SkColor kTransparent = SkColorSetARGB(0, 0, 0, 0);
gfx::Rect full_bounds = calibration_layer_->bounds();
gfx::Rect inner_bounds = full_bounds;
inner_bounds.Inset(insets_);
recorder.canvas()->FillRect(full_bounds, SK_ColorBLACK);
recorder.canvas()->FillRect(inner_bounds, kTransparent,
SkXfermode::kClear_Mode);
gfx::Point center = inner_bounds.CenterPoint();
int vertical_offset = inner_bounds.height() / 2 - kArrowGapWidth;
int horizontal_offset = inner_bounds.width() / 2 - kArrowGapWidth;
gfx::Canvas* canvas = recorder.canvas();
DrawTriangle(center.x(), center.y() + vertical_offset, 0, canvas);
DrawTriangle(center.x(), center.y() - vertical_offset, 180, canvas);
DrawTriangle(center.x() - horizontal_offset, center.y(), 90, canvas);
DrawTriangle(center.x() + horizontal_offset, center.y(), -90, canvas);
}
void OverscanCalibrator::OnDelegatedFrameDamage(
const gfx::Rect& damage_rect_in_dip) {
}
void OverscanCalibrator::OnDeviceScaleFactorChanged(
float device_scale_factor) {
// TODO(mukai): Cancel the overscan calibration when the device
// configuration has changed.
}
base::Closure OverscanCalibrator::PrepareForLayerBoundsChange() {
return base::Closure();
}
} // namespace chromeos
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